The Roidmude's Core (ロイミュードのコア,Roimyūdo no Koa), also known simply as Cores (コア,Koa), are the essence of the Roidmudes, acting as their 'soul'. They represent the Roidmudes' given numbers which distinguish them from each other (The numbers are pronounced individually; i.e., 029 is Zero-Two-Nine). The destruction of a Roidmude's Core results in their permanent death, but if their Core can survive the destruction of their body, they can be restored later.
Should a Roidmude's Core survive and escape the destruction of its body, it can make its way back to the Roidmude's ruling organization, which has several methods of preserving and reviving Roidmudes.
The tablet device possessed by Brain can, as well as preserving a Roidmude's Core, initiate a reset after absorbing the Core. This was performed on Roidmude 051, a rogue Roidmude whose actions risked compromising their operations and thus was executed by Chase. [Who Stole the Woman's Smile?]Roidmude 091's Core was also recovered this way without being reset. [What Can Keep Mach Running?]
Medic, who serves as a healer of the Roidmudes, can absorb a damaged Roidmude Core long enough for her to transport it out of harm's way so she can heal the Roidmude and help it reclaim its body uninterrupted. She first performed this on Roidmude 017, restoring him shortly after his first destruction at the hands of Kamen Rider Mach. This process was not a reset and allowed 017 to retain his evolved form. [Where Did That White Kamen Rider Come From?]
Destroying Cores[]
The only known way to permanently defeat a Roidmude via the destruction of their Cores is the power of Kamen RidersDrive, Mach, and Chaser normally via their Full Throttle finishing attacks performed using the Shift Cars and Signal Bikes respectively, but also includes vehicles such as Drive's car, Tridoron. It is still possible for Cores to occasionally survive the destruction of their bodies, though this can be averted by following it up with a direct attack on their Cores before they escape.
The first Kamen Rider created by Krim Steinbelt, Protodrive, had the power to destroy Roidmude bodies but was unable to destroy their Cores. After being defeated by the Roidmudes, Protodrive was converted into Mashin Chaser who is tasked with destroying rogue Roidmudes while leaving their Cores intact, however, because Mashin Chaser's technology is based off of Protodrive, it also possesses the same inability to destroy Cores.
Kamen Rider Lupin normally can't destroy Roidmude Cores since his powers originated from copying Mashin Chaser's. However, the former easily worked around this inability by simply crushing them with his bare hands after obliterating the bodies.
It is revealed that Roidmudes are able to destroy another Roidmude's core, raising Chaser's importance in resetting rogue Roidmudes as the other numbered Roidmudes are unable to do so themselves.
Medic would later create the Reaper Legion that consists of modified Roidmudes that are tasked to destroy Roidmudes and their Cores, though this was kept secret from Brain and Heart.
Kamen Rider Zi-O can destroy cores using any variation of Drive's powers in his arsenal, either by summoning Drive as GrandZi-O, or using the Drive Ridewatch in any capacity.
Roidmude 001: Following his evolution into the Freeze Roidmude, 001's body was briefly destroyed by Drive Type Formula's Trailer Impact before managing to immediately recreate it and reach his Over Evolved form. [What is Waiting at the End of Evolution?] His body was then destroyed again by Drive Type Tridoron Attack 1.2.3's Trailer Impact with his core being destroyed shortly after. [Who Claimed the Life of Shinnosuke Tomari?]
Roidmude 003: After fusing with Mitsuhide Nira to become the second Thief Roidmude, he fought Drive, Mach, and Chaser to little success after Drive Type Tridoron Kouji Genbar used Thief's grappling hook to his advantage, tying the Roidmude up and drilling through his body, ejecting Nira in the process, reverting him into his Over Evolved Brain Roidmude form. His body was then destroyed by the combined powers Drive Type Tridoron, Deadheat Mach, and Chaser's Triple Rider Kick, though his core managed to escape afterwards, only for Medic to "play" with it, much to his dismay. [Where Will the Bullet Guide Justice?] Though Medic deliberately put off giving him a new body due to focusing on her own agenda as well as their mutual disdain for each other, [Who is Aiming for the Ultimate Taste?][Why is the Devil Still Seeking Evolution?][When Will the Whirlwind Kidnapper Attack?] Brain was eventually restored, though Medic adds a countermeasure to reduce Brain back into core form as she wants. [Why Are the Two Genius Scientists Having a Conflict?] Later, after sacrificing himself to save Medic, his body disintegrated into dust along with his core. [Who Loves Heart the Most?]
Roidmude 007: 007's Core survived his first destruction during the Global Freeze, allowing his body to be restored by Medic. [Where is the Truth About the Goddess?] Though Drive has defeated 007 and destroys his body again, 007's core was resuced by Freeze and was later restored by Medic alongside his body. Following his forced devolution from his fused evolution into the Sword Roidmude, 007's Core was destroyed by Chaser's Across Breaker with the newly-obtained Shingou-Ax. [Where is Chaser Going?]
Roidmude 015: Following its recruitment into the Reaper Legion, 015, along with 035 and 075, was destroyed by Drive, Mach, and Chaser's Triple Rider Kick. [What is a Roidmude's Last Dream?]
Roidmude 017: Following his evolution into the Gunman Roidmude, 017's Core survived his first destruction at the hands of Mach thanks to Medic, who restored him to full health. [Where Did That White Kamen Rider Come From?] He was later permanently defeated alongside his "little brother" 018, having already had their bodies destroyed by Mach's Kaksarn-influenced Hit Macher, who followed it up with an Magarl-influenced shot from the Zenrin Shooter which intercepted their Cores before they could escape. [Why Won't My Little Brother Put On the Brakes?]
Roidmude 018: 018's Core was destroyed alongside Roidmude 017, having already had their bodies destroyed by Mach's Kaksarn-influenced Hit Macher, who followed it up with a Magarl-influenced shot from the Zenrin Shooter which intercepted their Cores before they could escape. [Why Won't My Little Brother Put On the Brakes?]
Roidmude 021: 021's Core survived his first destruction during the Global Freeze, allowing his body to be restored by Medic. [How is the Golden Drive Born?] Following its recruitment into the Reaper Legion, 021, along with 032 and 083, was destroyed by Chaser's Across Breaker. [Who Loves Heart the Most?]
Roidmude 024: Following his evolution into the Volt Roidmude, 024's body and Core was destroyed by Drive Type Technic Gravity's Rolling Gravity PerfecShot with the Door-Ju. [What is That Prideful Chaser Thinking?] However, Volt was able to bring himself back as Volt Ghost thanks to a special device which he created. [What Is in the Belt's Past?] Later, both the device and his copy were destroyed, the former by Kiriko's bullets and the latter by Drive Type Speed's Speedrop. [Who Can Prevent the Dark Christmas Eve?]
Roidmude 029: 029's Core managed to escape a battle with Drive which resulted in the destruction of two of his fellow Roidmudes and his body, retreating to Heart who provided a Cobra Type Viral Core for him. [Why Did My Time Stop?] Re-emerging soon after, he continued and successfully achieved his evolution into the Iron Roidmude before being permanently destroyed by Drive Type Speed Hunter's JustiSmash. [What is a Kamen Rider?]
Roidmude 032: Following its recruitment into the Reaper Legion, 032, along with 021 and 083, was destroyed by Chaser's Across Breaker. [Who Loves Heart the Most?]
Roidmude 035: Following its recruitment into the Reaper Legion, 035, along with 015 and 075, was destroyed by Drive, Mach, and Chaser's Triple Rider Kick. [What is a Roidmude's Last Dream?]
Roidmude 042: 042's body was destroyed by Drive Type Speed Spike's special attack, with his Core being destroyed as soon as it joined up with 088's Core. [Why Did My Time Stop?]
Roidmude 044: Following their recruitment into the Reaper Legion, 044, along with 094, was destroyed by Drive Type Dead Heat Flare's Dead Heat Drop when Medic used them both as meat shields. [When Did Kyu Saijo Become a Roidmude?]
Roidmude 047: 047's Core was destroyed alongside 048 and 049 when they suffered the power of Deadheat Mach's Zenrin Shooter while keeping the Thief Roidmude busy fighting Drive Type Tridoron. [Where Will the Bullet Guide Justice?]
Roidmude 048: 048's Core was destroyed alongside 047 and 049 when they suffered the power of Deadheat Mach's Zenrin Shooter while keeping the Thief Roidmude busy fighting Drive Type Tridoron. [Where Will the Bullet Guide Justice?]
Roidmude 049: 049's Core was destroyed alongside 047 and 048 when they suffered the power of Deadheat Mach's Zenrin Shooter while keeping the Thief Roidmude busy fighting Drive Type Tridoron. [Where Will the Bullet Guide Justice?]
Roidmude 050: Following his forced devolution from his fused evolution into the Seeker Roidmude, 050's body and Core was destroyed by Drive Type Formula Mantarn's Trailer Impact wielding the Trailer-Hou. [Why Were the Families Targeted?]
Roidmude 065: Following his evolution into the Judge Roidmude, 065 was permanently destroyed by Drive Type Wild Dump's Drirumble, which also incorporated the Drift Slash, as Drive was also wielding the Handle-Ken. [What Can Judge the Police?]
Roidmude 067: Following his forced devolution from his fused evolution into the Open Roidmude, 067's body and Core was destroyed by Drive Type Formula's Trailer Impact. [Who Reveals the Real Criminal?]
Roidmude 071: 071's Core was destroyed alongside 093 by being crushed under the wheels of Tridoron shortly after they were defeated in a chase with the car with a Max Flare Tire Extension Rider Break-like attack. [What is a Kamen Rider?]
Roidmude 073: Following its recruitment into the Reaper Legion, 073, along with 097 and 107, was destroyed by Deadheat Mach's Hit Macher. [Who Loves Heart the Most?]
Roidmude 075: Following its recruitment into the Reaper Legion, 075, along with 015 and 035, was destroyed by Drive, Mach, and Chaser's Triple Rider Kick. [What is a Roidmude's Last Dream?]
Roidmude 083: Following its recruitment into the Reaper Legion, 083, along with 021 and 032, was destroyed by Chaser's Across Breaker. [Who Loves Heart the Most?]
Roidmude 088: 088's body was destroyed by Drive Type Speed Shadow's special attack, with his Core being destroyed as soon as it joined up with 042's Core. [Why Did My Time Stop?]
Roidmude 089: Following its fusion with a Sealing Shuriken and a Shocker Belt to become the Shocker Buruburu, 089's body was destroyed by Drive Type Formula's Trailer Impact and Deadheat Mach's Hit Macher varient. During the death, a Sealing Shuriken was left behind due to the core fusing with the item. This Roidmude appeared in Shuriken Sentai Ninninger Vs. Kamen Rider Drive Spring Vacation Combining Special.
Roidmude 090: 090's body and Core were immediately destroyed following her forced devolution from her fused evolution into the Cook Roidmude by Drive Type Tridoron Kouji Genbar's Trailer Big Impact (w/ the Trailer-Hou). [Why is the Devil Still Seeking Evolution?]
Roidmude 091: Following his evolution into the Shoot Roidmude, his body was destroyed by Drive Type Formula's Trailer Impact and his Core was secretly spirited away by Brain, whom put him in his tablet. [Who Can Stop the Hoax Smile?] Following being restored and given upgrades, 091 was destroyed for good by Drive Type Formula's Trailer Impact and Deadheat Mach's Heat Kick Macher. [What Can Keep Mach Running?]
Roidmude 093: 093's Core was destroyed alongside 071 by being crushed under the wheels of Tridoron, shortly after they were defeated in a chase with the car with a Max Flare Tire Extension Rider Break-like attack. [What is a Kamen Rider?]
Roidmude 094: Following their recruitment into the Reaper Legion, 094, along with 044, was destroyed by Drive Type Dead Heat Flare's Dead Heat Drop when Medic used them both as meat shields. [When Did Kyu Saijo Become a Roidmude?]
Roidmude 097: 097's Core survived his first destruction during the Global Freeze, allowing his body to be restored by Medic. [How is the Golden Drive Born?] Following its recruitment into the Reaper Legion, 097, along with 073 and 107, was destroyed by Deadheat Mach's Hit Macher. [Who Loves Heart the Most?]
Roidmude 099: Following her evolution into the Angel Roidmude, her body and Core were destroyed by Chaser's Chaser End after being weakened by the Across Breaker to eject the Roidmude Cores she absorbed. [Drive Saga: Kamen Rider Chaser]
Roidmude 100: Following his recruitment into the Reaper Legion, 100 was destroyed by a combination Drive Type Tridoron's Tridoron Drift Slash and Lupin's Ultimate Lupin Stlash. [Type LUPIN: ~Lupin, The Last Challenge~]
Roidmude 103: Mortally wounded by Drive in battle, 103 was able to give Heart the means to revive Medic before succumbing to his injuries, with both his body and Core being destroyed in an non-explosive manner. [How Can I Get Used to the Cool Body?]
Roidmude 107: Following its recruitment into the Reaper Legion, 107, along with 073 and 097, was destroyed by Deadheat Mach's Hit Macher. [Who Loves Heart the Most?]
Roidmude 108: Following its evolution into the Paradox Roidmude, 108 was destroyed by Drive Type Special's Speedrop Type Special, however his Core is never shown on-screen. [Kamen Rider Drive: Surprise Future]
Zoruku Tojo: Designated '0L0' for unknown reason, possibly a reference to his old age, as the shape is similar to OLD. Originally human, Zoruku Tojo's consciousness was converted into a Core variant after he transfered himself into the Cyberoid ZZZ body. Using stolen data from the Roidmudes to become the self-proclaimed Kamen Rider Lupin, Tojo's consciousness abandoned his new Roidmude body after he was defeated by Drive. He later merged with a Bat Viral Core to manifest as a holographic Bat Type Roidmude. [Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle] However, after aiding Drive in fighting against Roidmude 100, his body got weakened in which was from his earlier encounter with Roidmude 100, and his core finally shattered. [Type LUPIN: ~Lupin, The Last Challenge~]
Megahex: Designated 'ZZZ' in reference to the abandoned Cyberoid ZZZ body which it absorbed, Megahex manifested its own unique Core which escaped the destruction of the initial ZZZ Megahex body. Merging with the Megahex planet, it was eliminated by the combined power of Drive and Gaim in the Type FruitsTridoron, destroying the planet and Megahex once and for all. [Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle]
Protozero: Designated '000', as Protozero is also known as Roidmude 000. Having been finally defeated as Mashin Chaser by Drive's new Type Formula with the Trailer-Hou, Chase was seemingly destroyed as he exploded with what was observed by Shinnosuke as his Core shattering as well. However, later on, Chase was shown to have somehow survived his apparent destruction when he was found by Kiriko, injured but alive. [How Can I Use the F1 Body to Fight?] However, his core finally shattered when Chase self-destructed to save Go from Gold Drive. [What is a Roidmude's Last Dream?]
Apparently, as is shown in the case of Cyberoid ZZZ and Zoruku Tojo, a human conscious will take the form of a Roidmude Core-like state after it is uploaded into a Core-less Roidmude-like body.